fn recycle_chunk<C: Columnar>(chunk: Column<C>, stash: &mut Vec<Column<C>>)Expand description
Reset chunk to an empty Typed and push it to stash for reuse.
Chunks recycled here come from the merger and chunker, both of which
produce Typed; only the typed allocations are worth caching for reuse.
Bytes / Align chunks have no typed-side allocation to preserve, so we
simply drop them — empty_chunk will produce a fresh default just as
cheaply, and pushing them onto stash would only displace useful
recycled allocations.